There are probably thousands of instances similar to this (not necessarily having to hand over your device) where US citizens are at the mercy of law enforcemen

There are probably thousands of instances similar to this (not necessarily having to hand over your device) where US citizens are at the mercy of law enforcement simply because we don't know what are rights are, and because often law enforcement either doesn't know or doesn't care. Civil rights often tend to be only as useful as our knowledge of what exactly they are.